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FAIR VALUE (Details) - Assets measured at fair value on a non-recurring basis (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014
FAIR VALUE (Details) - Assets measured at fair value on a non-recurring basis [Line Items]
Property and equipment, net	$ 521us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
Assets Measured At Fair Value On A Non Recurring Basis Subsequent [Member] | Fair Value, Inputs, Level 3 [Member]
FAIR VALUE (Details) - Assets measured at fair value on a non-recurring basis [Line Items]
Property and equipment, net	521us-gaap_PropertyPlantAndEquipmentFairValueDisclosure / rex_AssetsMeasuredAtFairValueOnANonRecurringBasisOverVariousDatesAxis = rex_AssetsMeasuredAtFairValueOnANonRecurringBasisSubsequentMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Assets Measured At Fair Value On A Non Recurring Basis Subsequent [Member]
FAIR VALUE (Details) - Assets measured at fair value on a non-recurring basis [Line Items]
Property and equipment, net	$ 55us-gaap_PropertyPlantAndEquipmentFairValueDisclosure / rex_AssetsMeasuredAtFairValueOnANonRecurringBasisOverVariousDatesAxis = rex_AssetsMeasuredAtFairValueOnANonRecurringBasisSubsequentMember

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- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258

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